-
IX. Read the following passage and mark the letter A, B, C ,or D on your answer sheet to indicate the correct answer for each of the questions
Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route Line by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.
Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.
The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.
The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail.
Câu hỏi:What does the passage mainly discuss?
-
A.
The mass migration of ants
- B. How ants mark and follow a chemical trail
- C. Different species of ants around the world
- D. The information contained in pheromones
Lời giải tham khảo:
Đáp án đúng: B
-
A.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
Hướng dẫn Trắc nghiệm Online và Tích lũy điểm thưởng
CÂU HỎI KHÁC
- He takes four paracetamol (A) everyday (B), not knowing (C) that will (D) seriously damage his liver
- Caroline has worn (A) her new yellow (B) dress only (C) once since she buys (D) it.
- Ancient people made a clay (A) pottery because (B) they needed it (C) for their survival (D).
- Up to now, the teacher _______ our class five tests.
- Christine _________ have arrived by now, she ______ have missed the bus.
- What did you have for ______ breakfast this morning?
- Stress and tiredness often lead to lack of _______.
- Sam’s uncle, ______ is very rich, came to visit our orphanage.
- Do you know that beautiful lady over there?” - Yes, that’s Victoria. She’s ______ in her group.”
- It was ________ easy for him to learn baseball because he had been a cricket player.
- It was found that he lacked the ________ to pursue a difficult task to the very end.
- Could you stand_________ for me and teach my English class tomorrow morning, John?
- Where’s that _________ dress that your boyfriend gave you?
- I went to a restaurant last night. I was the ten thousandth customer, so my dinner was on the ________.
- I can’t stand the car ____________ Therefore, I hate traveling by car.
- - Lisa: Have you been able to reach Peter?” - Gina: ___________.”
- - Would you bother if I had a look at your paper?” - ____________.”
- The bank announced that it was to merge with another of the high street banks.
- In remote communities, its important to replenish stocks before the winter sets in.
- His new yacht is certainly an ostentatious display of his wealth.
- After many year of unsuccessfully endeavoring to form his own orchestra, Glenn Miller finally achieved world fame in 1939 as a big band lead
- It started to rain at 2 o’clock and it is still raining.
- I will pay back the money, Gloria.” Said Ivan.
- Had she read the reference books, she would have been able to finish the test
- He is very intelligent. He can solve all the problems in no time.
- We cut down many forests. The Earth becomes hot.
- What does the passage mainly discuss
- The word intermittently” is closest in meaning to
- The phrase the one” refers to a single
- According to the passage, why do ants use different compounds as trail pheromones?
- The author mentions the trail pheromone of the leafcutter ant in line 11 to point out
- According to the passage, how are ants guided by trail pheromones
- The word oscillating is closest in meaning to
- According to the passage, the highest amount of pheromone vapor is found.
- What is the passage here mainly about?
- When was M.L. born?
- What is Martin Luthur King well- known for?
- According to the author, M.L. _______.
- Which of the following statements is NOT true
- From the passage we can infer that
- M.L. was _______ by the atmosphere in which he grew up.
- Some changes (46)_______ ecosystems. If there is too little rainfall
- If a kind of plant dies off, the animals (47)_______ feed on it may also die or move away
- Heat from a forest fire melts the seal and lets the seeds (48)_______.
- Building dams on rivers for electric power and irrigation can harm ecosystems (49)________ the rivers
- Ecologists are working with companies and governments to find better ways of (50)________ fish,
